Manufacture of cartridge case cups



Jan. 28, 1936. E. SAUTIER MANUFACTURE OF CARTRIDGE CASE CUPS Filed Aug.24, 1934 E m/Ye Sauzier f vW/araey fl/ t 9% Patented Jan.

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Mulhouse-Bourtawiller, (Haut-Rhin, France), a corporation oi? FranceApplication August 24, 1934, Serial No. 741,272 in Switzerland September16, 1933 ll Glairn.

be very pur'e'and particularly uniform. In order 1 1 to manufacturethese discs a block produced by a press must first be planed at bothends. A

sheet is then rolled hot from the block, the edges are cut oil, scrapedand planed and the sheet is then rolled within quite small limits to thenecessary thickness. Finally the sheet is pickled, neutralized androlled cold and discs are then stamped from the sheet so obtained andshaped into the form of cups which are then drawn to form the cartridgecases. The thickness of these discs must be correct to 9,025 mm.

In order the better to explain the present invention, this known methodoi manufacture is illustrated in Figures 1 to '7 of the accompanyingdrawing.

In these figures the disc 6 which is stamped from sheet metal isillustrated in Figure 1 in cross-section, and in Figure 2 in plan.

Figures 3 and 4 illustrate in cross-section and plan respectively theresult of the first working operation on the disc whereby the cup 2 isformed.

The Figures 5, 6 and 7 show in cross-section the results of furtheroperations whereby the cases 3, 4, are drawn from the cup 2.

The fibres a of the disc l stamped from the sheet metal run transverselythrough the disc, as will be seen from Figures 2 and 4. This is adisadvantage because on drawing the cup 2 there are formed at the placesindicated by b in 40 Figure 4 danger zones which on further iabricationcan give rise to the formation of cracks if the material is not quiteperfect and conse quently can be the cause of much waste. A furtherdisadvantage of this known method is that there is considerable wastagewhen the discs l are stamped from the sheets.

In order to obviate these disadvantages, it has previously been proposedto cut the discs from round bars and to form these discs into cups of 50smaller diameter than the discs in the same manner as the discs stampedfrom sheet metal.

Both the known methods of manufacture, however, had the disadvantagethat, in order to be able to form the disc into a cup, it was necessaryto use discs of which the thiclmess was less than that of the thicknessof the bottom of the final cartridge case, so that material for thebottom had to be displaced from the sides.

Both mentioned methods had the disadvantage that they were not welladapted for manufacturing cartridges having heavy bottoms such as areneeded for guns with heavy charges.

According to the present invention the block is first laterally shearedoil from the bar and then shaped in a die without being heated whilemaintaining its solid form and is then pressed in a second operatingstage and also without being heated into the form of a cup, ofsubstantially the same diameter as the block sheared from the bar, thethickness of the bottom of he cup being at the same time pressed to beequal to the thickness of the bottom of the final cart ridge case.

The new method of manufacture will now he explained, by Way of example,with the aid of Figures 8 to 13 of the'accompanying drawing, in Which:-

Figures 8 and 9 illustrate in cross-section and plan respectively, theblock which has been sheared off after shaping in a die;

Figure 10 illustrates in cross-section the cuplike body into which theblock is pressed;

-Figure 11 is a similar view showing the result of the first drawing,and

Figure 12 is a cross-section of the case after the final drawing.

Figure 13 shows the position of the cups in the tool at the beginning ofthe drawing operation.

Referring to Figures 8 to 13 in the method according to the invention,pieces are first sheared oi: laterally in exact lengths from round barsand are then shaped in a die to form solid blocks 6, as illustrated inFigure 8.

The solid block 6 is provided with a lower centering collar l and withan upper centering collar a which act as guides when the block ispressed into a cup.

The cup 9 which has the same diameter it as the piece from which theblock 6 was formed is then pressed from the block. 5 in one operationand is shown in Figure 10. V

This pressing operation has the advantage that the thickness ill of thebottom of the cup 53 can be regulated as desired, which is impossiblewith the known methods which have been described. The cup 9 can bepressed in such a way that the thickness l0 oi its bottom is pressed atthe same time to the thickness ii! of the bottom of the final case i i.

In the known methods, to height or the cup 2 which is first formed, itis'necessary to use a disc which is thinner than the thickness which thebottom is to have. Then the material for forming the bottom thicknessmust be displaced from the sides, which causes bad zones of material inthe bottom and which is not necessary according to the new method. Ingenlower diameter so as to be of such a height I! and so shaped that itis well prepared for the following drawing operations. Thus its uppercolguide for a prefixed ring [8 for centering the die l9 or matrix andthe lower part l6 acts as a guide for the die l9 and the lower part IIin its interior acts asja guide for the punch 20. Consequently, fordrawing the cases l3 and I from the cup 9, the drawing of the finishedcases from the cups 9 can be carried out in fewer stages than with theknown method and with less waste and using normal drawing angles.

What I claim as new and desire to secure by Letters Patent is:-

lar l5 forms a Method of making cartridge cases and the like whichcomprises shearing a blank laterally from a round bar, pressing saidblank in a die without being heated to form a solid block presenting anupper cylindrical collar and a lower rounded shoulder, this block beingthen pressed in a second operating stage and also without being heatedinto the form of a cup having a more elongated form than the pressedblock and the same upper diameter as the pressed block. 1

EMILE SAUTIER.

